import React, {useContext, useEffect} from 'react';
import Horizen from '../../baseUI/horizen-item';
import { categoryTypes, alphaTypes } from '../../api/config';
import { CategoryDataContext } from './data';
import { 
  NavContainer,
  ListContainer,
  List,
  ListItem,
} from "./style";
import { 
  getSingerList, 
  getHotSingerList, 
  changeEnterLoading, 
  changePageCount, 
  refreshMoreSingerList, 
  changePullUpLoading, 
  changePullDownLoading, 
  refreshMoreHotSingerList 
} from './store/actionCreators';
import  LazyLoad, {forceCheck} from 'react-lazyload';
import Scroll from './../../baseUI/scroll/index';
import {connect} from 'react-redux';
import Loading from '../../baseUI/loading';
import { CHANGE_CATEGORY, CHANGE_ALPHA } from './data';

function Singers (props) {
  const { singerList,
    enterLoading,
    pullUpLoading, 
    pullDownLoading, 
    pageCount } = props;

  const { 
    getHotSingerDispatch,
    updateDispatch,
    pullDownRefreshDispatch,
    pullUpRefreshDispatch,
  } = props;

  const {data, dispatch} = useContext(CategoryDataContext);

  const {category, alpha} = data.toJS();

  useEffect(() => {
    if(!singerList.size) {
      getHotSingerDispatch();
    }
    // eslint-disable-next-line
  }, []);

  let handleUpdateAlpha = (val) => {
    dispatch({type: CHANGE_ALPHA, data: val});
    updateDispatch(category, val);
  };

  let handleUpdateCatetory = (val) => {
    dispatch({type: CHANGE_CATEGORY, data: val});
    updateDispatch(val, alpha);
  };

  const handlePullUp = () => {
    pullUpRefreshDispatch(category, alpha, category === '', pageCount);
  };

  const handlePullDown = () => {
    pullDownRefreshDispatch(category, alpha);
  };

  const renderSingerList = () => {
    const list = singerList ? singerList.toJS() : [];
    return (
      <List>
        {
          list.map((item, index) => {
            return (
              <ListItem key={`${item.accountId}${index}`}>
                <div className="img_wrapper">
                  <LazyLoad placeholder={<img width="100%" height="100%" src={require('./singer.png')} alt="music"/>}>
                    <img src={`${item.picUrl}?param=300x300`} width="100%" height="100%" alt="music"/>
                  </LazyLoad>
                </div>
                <span className="name">{item.name}</span>
              </ListItem>
            )
          })
        }
      </List>
    )
  }

  return (
    <div>
      <NavContainer>
        <Horizen 
          list={categoryTypes} 
          title={"分类 (默认热门):"} 
          handleClick={handleUpdateCatetory} 
          oldVal={category}></Horizen>
        <Horizen 
          list={alphaTypes} 
          title={"首字母:"} 
          handleClick={val => handleUpdateAlpha (val)} 
          oldVal={alpha}></Horizen>
      </NavContainer>
      <ListContainer>
        <Scroll
          pullUp={ handlePullUp }
          pullDown={ handlePullDown }
          pullUpLoading = { pullUpLoading }
          pullDownLoading = { pullDownLoading }
          onScroll={forceCheck}
        >
          { renderSingerList() }
        </Scroll>
        <Loading show={enterLoading}></Loading>
      </ListContainer>
    </div>

  )
}

const mapStateToProps = (state) => ({
  singerList: state.getIn(['singers', 'singerList']),
  enterLoading: state.getIn(['singers', 'enterLoading']),
  pullUpLoading: state.getIn(['singers', 'pullUpLoading']),
  pullDownLoading: state.getIn(['singers', 'pullDownLoading']),
  pageCount: state.getIn(['singers', 'pageCount'])
});
const mapDispatchToProps = (dispatch) => {
  return {
    getHotSingerDispatch() {
      dispatch(changeEnterLoading(true));
      dispatch(getHotSingerList());
      dispatch(changeEnterLoading(false));
    },
    changeEnterLoadingDispatch(value) {
      dispatch(changeEnterLoading(value));
    },
    updateDispatch(category, alpha) {
      dispatch(changePageCount(0));
      dispatch(changeEnterLoading(true));
      dispatch(getSingerList(category, alpha));
    },
    // 滑到最底部刷新部分的处理
    pullUpRefreshDispatch(category, alpha, hot, count) {
      dispatch(changePullUpLoading(true));
      dispatch(changePageCount(count+1));
      if(hot){
        dispatch(refreshMoreHotSingerList());
      } else {
        dispatch(refreshMoreSingerList(category, alpha));
      }
    },
    //顶部下拉刷新
    pullDownRefreshDispatch(category, alpha) {
      dispatch(changePullDownLoading(true));
      dispatch(changePageCount(0));
      if(category === '' && alpha === ''){
        dispatch(getHotSingerList());
      } else {
        dispatch(getSingerList(category, alpha));
      }
    }
  }
};   

export default connect(mapStateToProps, mapDispatchToProps)(Singers);